But you may be wondering which option, or options, to use in your application. Apps adopting Core Data can use Core Data with CloudKit as long as the persistent store is an NSSQLite Store Type store, and the data model is compatible with CloudKit limitations. How to save JSON data in Core Data? Core Data traces its roots over 25 years with NeXT's Enterprise Objects Framework (EOF) [1]: > Many of the core concepts of EOF re-emerged as part of Core Data, which further abstracts the underlying data formats to allow it to be based on non-SQL stores. To do this, open the Core Data model editor, select the Entity that needs a unique contraint and use the Data model inspector in the right-hand sidebar to add Constraints . For a simple data model with common constraints, the options the data model offers may be sufficient. The app can write records to the database successfully. To help Core Data perform the migration, though, you may have to provide information about how to map from one version of the model to another. It frees developers from such work, as iOS 9 introduced constraints in Core Data. If you'd like to use an Attribute to add Unique Keys to your Entity Framework Core … For example, CloudKit does not support unique constraints, undefined attributes, or required relationships. I have an ASP.NET Core application using Entity Framework Core. The short answer is that it IS possible, but not an out-of-the-box feature from the EF Core Team. The database has many data-consistency constraints built into the tables and I would like to enforce those at the application level also against input records sent from a client for writing to the database. When EF Core writes data out to the database it doesn’t validate that data (see Introduction to validation section for more on validation). What about the modern Core Data framework? While Core Data should typically not be treated as a store that has a concept of primary keys, we can apply a unique constraint on one or more properties of a Core Data model. By convention, when targeting a relational database, foreign key constraints are named FK___. A constraint is an attribute (or a comma-separated list of attributes) that places unique requirements on an entity. (data needs to be loaded from disk to memory) The OP is asking about whether it is possible to add an Attribute to an Entity class for a Unique Key. Select the User entity and mark every attribute as required by unchecking the Optional checkbox in the Data Model Inspector. This depends on your preference and the requirements of the project. Core Data: Don’t have Data Constraints,if required need to implement by business logic. However, a relational database will apply its own validation, such as checking that a unique index constraint hasn’t been violated, and will throw an exception if any constraint is breached. Core Data provides developers with several APIs for implementing data validation. Unique constraints prevent duplication of records in SQLite storage. For composite foreign keys, becomes an underscore separated list of foreign key property names. 5. Having the ability to add constraints to a data model is a powerful concept and it is nice to know that this is built into the Core Data framework. Core Data can then use this model to open persistent stores created using any of the model versions, and migrate the stores to the current version. For example, CloudKit does not support unique constraints, undefined attributes or required relationships. Foreign key constraint name. 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